AMSAT is a name for amateur radio satellite organizations worldwide, but in particular the Radio Amateur Satellite Corporation (AMSAT-NA) with headquarters at Kensington, Maryland, near Washington, D.C. AMSAT organizations design, build, arrange launches for, and then operate (command) satellites carrying amateur radio payloads, including the OSCAR series of satellites. Other informally affiliated national organizations exist, such as AMSAT Germany (AMSAT-DL) and AMSAT Japan (JAMSAT).

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AMSAT-NA was founded in 1969 in Washington, D.C. to continue the efforts begun by Project OSCAR. Its first project was to coordinate the launch of OSCAR 5, constructed by students at the University of Melbourne.[1] Some design modifications were needed and were made by AMSAT members, and the satellite was successfully launched on January 30, 1970 on a NASAThor Delta launch vehicle.[2]

AMSAT's next launch was AMSAT-OSCAR 6 (AO-6) on October 15, 1972. AO-6 was AMSAT's first long-life satellite, and was built with participants from Australia and West Germany. Command stations in Australia, Canada, Great Britain, Hungary, Morocco, New Zealand, the United States and West Germany controlled the satellite, contributing greatly to its 4½ years of service.[3] Further launches continued to emphasize international cooperation, with AMSAT-OSCAR 7 (AO-7) launching with a new transponder developed and built by Karl Meinzer and AMSAT Germany (AMSAT-DL). AMSAT Japan (JAMSAT) contributed a transponder to AMSAT-OSCAR 8 (AO-8).[4]

In order to launch its satellites, AMSAT has worked with space agencies and commercial launch contractors to develop new ways to take advantage of unused areas of launch vehicles. In return, AMSAT sometimes can negotiate a reduction or waiver of launch costs. One of the most significant is the Ariane Structure for Auxiliary Payloads (ASAP), developed and manufactured in partnership with the European Space Agency in 1990 for use on its Ariane 4 launch vehicle. AMSAT was again able to take advantage of unused space with the launch of AMSAT-OSCAR 40 (AO-40), occupying unused space on an Ariane 5.[1]

The IPS (Interpreter for Process Structures) programming language was specifically written for the RCA 1802 AMSAT Phase III satellite.[5][6]

From its first launch, AMSAT projects have had international scope. As of 2006, 21 countries have launched an amateur satellite. Many of these countries have their own AMSAT affiliate, some of which are noted below:

AMSAT Germany (AMSAT-DL, AMSAT Deutschland) has built and managed projects of several amateur radio satellites, notably AO-40.

AMSAT Japan (JAMSAT) has contributed to many satellites, in addition to launching its own satellites in cooperation with JAXA: the Fuji-OSCAR series.

Phase 3: Long life, more powerful communications, telemetry and command systems. Highly elliptical orbit, usually a Molniya orbit; usually the initial orbit is a geostationary transfer orbit, onboard propulsion systems boosting it to its final orbit. Because of the highly elliptical orbit, the satellite remains over an area for long periods of time, allowing amateurs longer contacts through the satellite.

Phase 4: Amateur satellite in geostationary orbit. Phase 4 amateur satellites have been designed, but not built, though they have received favorable attention.[8]

Most amateur satellites do not receive their sequential OSCAR designation until after they are successfully in orbit, and then only at the request of the launching organization.[1] Regardless, amateur satellites will have been named by the organization that constructed it, and that name is frequently prepended to its OSCAR designation, resulting a name such as CubeSat-OSCAR 57. In conversation, names are usually abbreviated as CO-57 or similar.

The names of the satellites below are sorted in chronological order by launch date, ascending. The status column denotes the current operational status of the satellite. Green signifies that the satellite is currently operational, orange indicates that the satellite is partially operational or failing. Red indicates that the satellite is non operational and black indicates that the satellite has re-entered the earth's atmosphere. The country listing denotes the country that constructed the satellite and not the launching country.

AMSAT-NA is currently building a series of 1U cubesats to carry university experiments, including a camera, and mode U/V FM repeaters. The first of these satellites, Fox-1A, is manifested for launch in August 2015.